[MoM] Oubliette works on NPCs now

[Standing-Storm]

Summary

Mods "[MoM] Oubliette works on NPCs now"

Purpose of change

When working on #72784, I learned how to account for banishment on NPCs using EoCs, so it's time to let Oubliette affect NPCs too.

Describe the solution

Change Oubliette to an EoC that saves the damage-calculations as a variable on the target and compares it to their HP. If greater than their HP, they disappear to another dimension.

Describe alternatives you've considered

Testing

Banished some NPCs and monsters. Usually it worked, sometimes it didn't (thanks to random damage). At low levels, the reverse was true.

Additional context

if teleporting to alternate worlds or Nether subdimensions is ever implemented, be prepared for feral Teleporters to use Oubliette on you.